[Elecraft] K2/100 # 2469

[Dan Holloway]

Hello,

#2469 lives again.  I finally located a sig gen so that I could begin 
signal tracing in the IF strip.


As I was beginning, I touched Q21 and the receiver came alive again.  A 
close inspection of the rx pre-amp (on or off, previously tested) showed 
nothing obviously amiss.  I reheated all solder joints in the area and 
the receiver seems normal again.


In spite of my efforts to protect it, I suppose it is a consequence of 
the rig often being near salt water and in tropical heat.


I will now re-install the KPA100 and see if anything misbehaves.  If it 
is still OK next month, it is going with me to OC-206.


Thanks again to those who emailed suggestions.

73 de Dan
VK8AN 


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[Elecraft] Help: K2/100 # 2469

[Dan Holloway]

Hello all,

While checking my K2/100 before heading off on an IOTA trip (to OC-206 
in August), to my amazement, I discovered that the receiver was dead.  I 
have tried to resolve the problem but so far have failed to fix it.


I appeal to the very knowledgeable folks here for assistance.

Symptoms:  Transmit is normal, with the KPA100 and without (QRP); 
sidetone, spot and keying are normal.
Receive: Only a hiss is audible.  I can very faintly hear the XG1 on 
7040 kHz (RF and AF gain full).  With an antenna connected, I can very 
faintly hear WWVH's tones on 10 MHz.  I first suspected the switching 
diodes D2, D3 and D4 on the RF board but their voltages are normal as is 
the 8V output of U4 on the RF board.  I recently built and installed the 
KNB2.  I have only removed and reinstalled it.  I have not removed it 
and reinstalled W5.  The NB display is as expected.  Turning it on/off 
has no noticeable effect on the receiver.  This rig also has the K160RX 
installed and I have removed and reinstalled it.  I have gone through 
the Primary and Secondary menu options and have discovered nothing that 
affects the receiver.


Prior to installing the KNB2, all was well; in fact, the rig managed to 
work QRPDXCC so the rx was good then.


I suspect that this is a very simple fix.  Can someone help me?  I won't 
be surprised if I am the problem and just can't see the forest for the 
trees!


Thanks in advance and 72/73,

Dan
VK8AN
K2/100 # 2469

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